International Search Report for PCT Application No. PCT/JP02/09779 mailed Dec. 3, 2002 with English translation of Form PCT/ISA/210. cited byother.

Abstract:

An optical disk according to the present invention is the optical disk on which secret information on unique information given to a specific optical disk manufacturer or a specific optical disk and information recorded on an infringement disk list of identifying an illegitimate optical disk manufacturer or an illegitimate optical disk are recorded in advance, and the optical disk has an area in which reproduction-only encrypted data encrypted based on the secret information and the information on the infringement disk list is recorded in advance or an area capable of recording the encrypted data to be encrypted based on the secret information and the information on the infringement disk list.

Claim:

The invention claimed is:

1. An optical disk comprising first information relating to unique information given to a specific optical disk manufacturer or a specific optical disk and secondinformation of identifying an illegitimate optical disk manufacturer or an illegitimate optical disk are recorded in advance, wherein said optical disk comprises an area in which encrypted data encrypted based on said first and second information isrecorded in advance or an area capable of recording the data to be encrypted based on said first and second information.

2. The optical disk according to claim 1, wherein third information relating to the unique information given to a specific optical disk drive manufacturer or a specific optical disk drive is recorded on said optical disk in advance and saidthird information is also used for said encrypting.

3. The optical disk according to claim 2 comprising an area capable of recording as fourth information the information corresponding to said optical disk manufacturer determined to be illegitimate or said optical disk drive determined to beillegitimate, said fourth information also being used for said encrypting.

4. An optical disk according to claim 1, said optical disk in an optical disk drive, comprising: first information deciphering means of deciphering the first information relating to the unique information given to a specific optical diskmanufacturer or specific optical disk recorded on the optical disk, second information storage means of obtaining second information of identifying an illegitimate optical disk manufacturer or illegitimate optical disk, first determination of determiningwhether or not said optical disk is illegitimate based on the deciphering results of said first information deciphering means and storage contents of said second information storage means, and control means of controlling reproduction of the data fromsaid optical disk and/or recording of the data on said optical disk based on the determination result of said determination means.

5. An optical disk drive, comprising: first information deciphering means of deciphering the first information relating to unique information given to a specific optical disk manufacturer or specific optical disk recorded on the optical disk,second information storage means of obtaining second information of identifying an illegitimate optical disk manufacturer or illegitimate optical disk, first determination of determining whether or not said optical disk is illegitimate based on thedeciphering results of said first information deciphering means and storage contents of said second information storage means, and control means of controlling reproduction of the data from said optical disk and/or recording of the data on said opticaldisk based on the determination result of said determination means.

6. The optical disk drive according to claim 5, wherein said second information is information recorded on said optical disk in advance and/or obtained via the Internet.

7. The optical disk drive according to claim 5, comprising: unique information storage means of storing apparatus unique information given to a specific optical disk manufacturer or a specific optical disk drive, and second determination meansof reading said apparatus unique information and check it against third information on said apparatus unique information recorded on said optical disk in advance to determine whether or not said optical disk drive manufacturer is illegitimate or whetheror not said optical disk drive is illegitimate, wherein said control means also utilizes the determination result of said second determination means.

8. The optical disk drive according to claim 7, comprising: fourth information storage means of obtaining and storing the fourth information corresponding to the optical disk manufacturer or optical disk drive determined to be illegitimate, andupdating means of updating and recording said fourth information in the data area of said optical disk based on storage contents of said fourth information storage means, wherein said second determination means makes said determination by also utilizingthe processing result of said updating means.